In article <slr### [at] rongwmicrocom>, 
ron### [at] povrayorg wrote:

> On 13 Dec 1999 10:00:22 -0500, ingo wrote:
> >Would it be possible to change trace(), so that it, next to the normal, 
> >also 
> >returns the colour of the hit point?
> 
> It would, but in keeping with my usual principle of making things as 
> flexible
> as possible, I'd prefer to see this functionality implemented as a 
> separate
> function that returns the color of a given texture at a given location, 
> since
> then it's not tied to an actual object.  I know that that patch has been 
> written, more than once, so I'm surprised it's not in MegaPOV.

I have written an eval_pigment() function that returns the color of a 
pigment at a certain point. This might do what you want, but you have to 
know the pigment used on the object, and it is limited to pigment.

Making a function that acts like trace, but returns the color of a point 
taking lighting into account would probably not be possible, because the 
lighting could depend on parts of the scene not processed yet.

-- 
Chris Huff
e-mail: chr### [at] yahoocom
Web page: http://chrishuff.dhs.org/

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